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Earnings Per Common Share (Tables)
12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Net Earnings Per Share
The table below reconciles the weighted-average basic and diluted common shares outstanding for 2016, 2015 and 2014:
 
Year Ended December 31, 2016
 
2016
 
2015
 
2014
 
(in thousands)
Weighted average number of common shares outstanding - basic
72,754

 
71,826

 
70,616

Effect of dilutive securities (1)
720

 
686

 
725

Weighted average number of common shares outstanding - diluted
73,474

 
72,512

 
71,341



(1) Certain outstanding stock options awards are anti-dilutive and were therefore excluded from the calculation of the weighted average number of diluted common shares outstanding. For the years ended December 31, 2016, 2015 and 2014, the computation excluded options to purchase 0.5 million, 0.9 million and 0.5 million shares, having weighted average exercise prices of $34.14, $29.34 and $27.97, respectively.